Material forming apparatus



Sept; 14, 1943. M N 2,329,256

MATERIAL FORMING APPARATUS Filed Jan. 20, 1942 3 Sheets-Sheet l INVENTOR E. EDELMAIV Arron/v27 Filed Jan. 20, 1942 3 Sheets-Sheet 2 INVENTOR B. EDELMAN A TTORNEV Sept. 14,' 1943.

Filed Jan 20, 1942' B. EDELMAN MATERIAL FORMING APPARATUS l5 Sheets-Sheet 3 FIG. 7

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oooooooooooooooooqqq OOOOOOOOOOOOOOOOOO INVENTOR 8. EDELMA/V @BJ'flW- a ATTORNEY Patented Sept. 14,1943

UNITED rwl us Ber-i1 Edelman, Brooklyn, N. Y -ass ig nqrflto ern Electric Company, Incorporated, New York,- N. Y., a corporation of New York A plication January 20, 1942, 'ScriaIiNbi t-ZZ IZ? 9' Claims (01. 16 1-22)- This invention relates to material forming app'aratus and'more particularly to apparatus for forming or punching blanks from sheet material.

'The cutting out or forming-of blanks from sheet stock by means of coacting, interfitting, punch and die members is a very old one; especially as embodied in therfamiliar punch press, in which -n'e of the coa'cting members is supported'ona stationary, rigid supporting block while the other. is actuated by a'reciprocating ram. Such machineshave been and are entirely satisfactory,

generally speaking; so far as the accomplishment -'0f thedeSired-reSuIt is concerned. jHoWeVer they are usuallyextremely noisy and, because o'fthe necessary reciprocation of-massive parts, are wasteful of energy and'require foundations far *more massive and rigidthan are required to suppor't their'weight. In another class of machine for the same general "purpose, punch members are formed on-or attached to the periphery, of a wheel or roller, tofcoact with corresponding; die

members formed in or attached to the periphery of a second wheel or roller. Much of the'noise "and waste of power are obviated in this fashion? and such machines are satisfactory forfmany uses. But, in such amachine,.unless the wheels or rolls are madeimpracticably great in diameter,

the angular change of position to each other of the punch and die from the time the punch begins of Fig. "-1;

ence numerals are appliedfto identical parts in the several figures 'and in which ;-F1'g.1-1 isa diagrammatic view in si elevation of a. machine constructed in" accordancewith the-invention; 1

Fig. 2 isa-plan view thereof; V Fig.- 3 is an end yiew thereof "onthe line 3-3 j 1 ig. 4 is a broken detail section on the line 4- 4'idf Fl"g. 1 w'iththe belt Tmbvd; g anenlarge'djpartial sect-ion on the line N Fig. B-is a detached-edge iew of a portion of a preferred form of punch belt;

- Fig. '1 isfa rvrse 'plan' viewer the showing Fig-r 8 ijsra plan view-of a portion of die belt corresponding-to the showing of Fig. 6; Y v Figi9is-aivi'ew'siinilar'toFig. 6 of another form of punch b'elt;

Fig. 10 a reverse=plan view of the showing of Fig; 11 is"altrarisversesection of the 'two belts ofFigsLr-Q and 10 actingt'o cut a blank from a piece of stockbetween them. l i

Ks "herein disclosed; theihrirition is illustrated in a machine "for cutting "blanks from a, ribbonlikesheet of stock l9; 'drawn by 'the'action 'of the machine jrrom a supply l8,ancl wound 'up 'to' enter the die until it finally leaves, may ren- V der such a machine impracticable, for some classes of work.

' An object of the present invention is to provide a' reliable, accurately functioning apparatus l for forming blanks from'sheet stock in which punch and die members are caused to move toward and away from each otherfor the blanking operation substantially, without angular motion with respect to each-other'an'd in which there are no massive reciprocatory members.

i .Withthe above and other objects inview the invention may be embodiedin ya machinefor blanking sheet stock wherein a sheetof'stock is drawn between a pair of endless-imetalbelts passing between a pair ofroppos'ed pressure-rolls, the belts being kept in mutual registry by pi'nson ,one matchingperforations' on th'e other, one"b'elt having die openingsand the other having' punch members plvotally carried thereon. 3

Other objects and features will appe'arfrom v the following detailed d'escription of on'e'embodim'ent thereof takenin connection with'the accompanying drawingsiin which the same refer-M {The beltilis provid as scrap, after-theblanks have been cutout, on a 'take up reel *li'l, drivenby a belt from the ma chine. 1 1" I I The heart of the machine is comprised of apair of-endle'ss steel belts!!! and 21, having the stock 1'9 between them; and r nnin with the stockv between a pair of pressurefrolls 22and l3, all

suitably mounted i'n a: rigid frame. 'At the left end 'of thefmach-ine; the* belt' 20 runs overi'and r is driven' byaiolljZQ, while the'be'lt 2! runsfover andls riveiibya r011 '25. 1 The mus 24 and 25 ar 0 in synchronismby. @flgear chain 26, ,3l, 29, 21. The shafts ofthese' two rolls nailed in fixedfpositions in the, :fram'e. The shaft of thei earza is driven thro g -gears 33 and 32 fro meter 3"4;andthus drives both rolls 124 and 25, "Atthe, right end of 'thie ma chinathe :belts'fiq'and y2lfljjrun over idler tensioning rolls 351and '3'l"respecti'vely; mounted to be adjustable toward and from the rolls 24 and 25 to maintain suitable tensionsin the belts. The take-up roll ll'l'nay be co veniently driven -by suitable belts 3'8 and 'from' ef'the above mentionedshaftsye. g. the shaft'bfjgafs'28 and .30 as sh wn;

Ohfits "outer side near the'sixgears just mentioned are all'jour- Thus the roll 25 drives the belt 2| and the belt 2| drives the belt. 20. Y The pins 40 a e omitted in Figs. 1, 6 and'9 to avoid confusing them with other pins also carried by the belt 20; but the pins 40 are shown in Figs. 2,3, '7, 10 and 11. At the driving the belt through the pins 40. In time they may wear and tend to make the re'gistery of the punches 46 with the die apertures 41 inexact.

The arrangement of the base 44 with its locating 20, enables the pointedended pins 55, entering the same time the pins 40 and perforations 4| maintain continuously accurate registration of the belts 20 and 2 I, both laterally and longitudinally.

The cylindrical rolls 25, 23 and31 are so located that their respective uppermost elements are in one horizontal plane, so that the belt 2| in passing from the roll 31 over the roll 23 to the roll moves substantially in a horizontal plane, The roll 35 is located somewhat up from the roll 31; and;th e roll 24 islsimilarly up from the roll '25 and about level with the .roll36; while theroll 22 is lower and presses "the belt 20 down between the rolls 36 and 24 to have operative engagement between the rolls 22 and 23 with the stock H3 and the-belt 2|. Hence the belts 2il and 2| are spaced. omewhat apart as they leave the rolls 36 and .31, approach and'engage each other with the stock between at the press rolls 22 and 23, and draw somewhat apartagain as they pass on to the rolls 24 and 25. This separation of the belts is somewhat exaggerted in the drawing-s for clarity. In practice the separation would preferably be little more than enough to allow the pin 48 to clear out of the perforations 4|,

especially atthe right. side where thefbeltsapproach the press rolls. It may also be notedthat the belts 25 and 2| are. preferably of equal length and hence thedistance between therolls 24 and tween the rolls 25 and 31. I

The preferred forms of the belts 20 and 2lware best shown in Figs. 6, '7 and 8.- Itis to. be remembered in considering thesethat the pins-.40, shown in-Fig. 7,;are omitted infig. 6.' I' he,belt 28,. as hereshown, is provided along-the center line of. its outerj-side with a rowof equi-spaced,

as will ordinarily be a littlefless than thatbecompound punch-members generally indicated at 42. Each such assembly comprises a base 44 anda punch'prope'r 46'heldtogether and secured to the belt by a pairof rivets 48. Each rivet .48 is ri idiin the belt,.-but passes through a longitudinally elongated holefin; each of the members 44 and 45. Thus the two members and 46 are securely held tothebelt, with substantially no freedom ;of motion transversely of the belt and with a 'limited' freedom of motion longitudinally pfthe belt .The base 44 is a'rectangular thin perforations 5|, before the punchenters the die, to force the punch to register accurately with the die just before each cutting operation.

As shown in Figs. 6, '7 and 8, the pins and perforations 5| are so located that the pins punch through the material being worked on. In many instances, this is unobjectionable or even preferable as tendingto hold the portion of sheet being operated on more firmly. The pins 50 and holes 5| may, however, be spaced to lie outside the width of the punch 45 if desired. Similarly, with some materials the pins 4!] may also punch through the sheet being worked on, or the belts may be made wide enough and the two rows of pins far enough apart to obviate this. 7

In some instances the extreme nicety of registration of punch and die thus obtained may not be necessary. In such case, the punch I46 is secured directly and rigidly to the belt by'the rivets I48, andthe locating pins I50 are mounted directly in the belt as in the modified form shown in Figs. 9, l0 and 11. For simplicity, this form is also illustrated in Figs. 1, 2 and 3, although the form of Figs. 6, 7 and 8 may be preferred fornice work. 7 I 1 Asflshown in Fig. 11, the thickness of the die belt 2| is at least great enough that each die-aperture may contain both the punch and the cut blank l5. The cut blanks remain frictionally held in the die. apertures after the punches have been 'pulled, out of the dies by the separating belts piece of rigid metal, e. g. steel,,somewhat larger than the punch properf lfiand so assembled as to project beyond'the punch member forwardly thereof, i. e. onthe advancing end. Near 'its forward edge, 'thelbase. 44, is provided with. two

outwardly projeetin'glocating' pins 53,.spaced. 1st

erallywell apart.v .The punch proper 46 is a flat piece ofrigi-d metal, e. g. steel, whosecontour is that of the blank to befcutfrom the stock and whose thicknes is somewhat greater than that of the stock. Thebelt'ZI, as alreadynoted, has the perforations 4| to'coact with the pins 45 of the belt 20. The belt2'l isal'so formed with perforations 5| to coact with the pins 50 and aper- 'turS 4'| to coact as dies with the punches 46.

The perforations 41 in the belt 2| have the double duty of driving the'belt from the pins 35 and of leaving the press rolls. To force the blanks out of the die apertures, the'mechanism shown in detail in .Figs. 4 and .5, is-provided. The shaft 43 of the roll 25 is made non-rotatable. and the roll rotatable on the shaft.- A cam 45 is rigid on the shaft inside the roll. Radial, spring pressed, knockout pins 49 are mounted radiallyin one or more rows (here two) circumferentially around the middle periphery'of the roll 25 spaced and arranged to register, singly or in groups as the size of blank may require, with the die apertures. The cam 45 is so. shapedas to force the pins radially out through the die apertures as'the belt moves down over the extreme left of the roller 25 and allows them to be retired inwardly by their springs after passing the bottom of the roll. The blanks forced out of the die apertures by these pins fall through a chute 52into some suitable container 53.

, It must be emphasized that, for clarity in drawings both the angle of approach of the belt 20 to the belt 2| at the right of the pressrolls 22 and 23, and the angle of departure of the belt 2|) from the belt 2| at the left of the press rolls have been considerably exaggerated; In prac- -tise, these angles may be made so small that there is'practically no materially efie'ctive angular motion of'the punch relatively to the die during the punching operatiod Because'the punch is attached to thebelt 20 only along a transverse line by the. rivets 48 or I48, the punch. i neither curved originally nor is it flexed at any point I along its travel; hence it is simple totmake, being merely suitably outlined holes in th body of the belt. There being no reciprocatory parts required, the machine is quiet in operation and tion as particularly described and pointed out in the appended claims.

What is claimed is:

1. Apparatus for cutting blanks from sheet stock and comprising a pair of flexible belts" to receive sheet stock therebetween, a pair of press rolls between which the belts and stock run, a

punch member attached to one belt, the other belt being formed with a die aperture to coact with the punch member, and'coacting elements on the two belts to enforce registry of the punch member and die aperture.

2. Apparatus for cutting blanks from sheet' stock and comprising a pair of flexible belts to receive sheet stock therebetween, means to drive one of said belts, coacting means on the two belts to cause the driven belt to drive the other belt, I a pair of press rolls between which the belts and stock run, a punch member attached to one belt, and the other belt being formed with a die aperture to coact with the punch member.

receive sheet stock therebetween, means to drive one'of saidbelts, coacting means on the two belts ,to cause thedriven belt to drive the other belt, a pairof pressrolls between whichthe belts and stock run, a flat slab-like punch member attached to one belt only along a line transverse to the belt, the other belt being formed with a die aperture to coact with the punch member, and coactin-g elements on the two belts to enforce registry of the punch member and die aperture.

7. Apparatus. for cutting blanks from sheet stock and comprising an endless flexible die belt of sheet metal having a longitudinal sequence of equi-spaced die apertures formed therein, a drive roll and a press roll and a tensioning roll for the die belt and all tangent to one plane to maintain a portion of the belt flat, the die belt being Y also formed with a sequence of drive perforations, drive pins on the drive roll to engage the perforations in the die belt to thereby drive the die belt, an endless flexible punch belt running 3. Apparatus for cutting blanks from sheet stock and comprising a pair of flexible belts to receive sheet stock therebetween, means to drive one of said belts, coacting means on the two belts to cause the driven belt to drive the other belt,

a pair of press rolls between which the belts and stock run, a punch member attached to one belt, the other belt being formed with a die aperture to coact with the punch member, and coacting elements on the two belts to enforce the punch member and die. aperture.

4. Apparatu for cutting blanks from sheet stock and comprising a pair of fl'exiblebelts to receive sheet stock therebetween, a pair of press rolls between which the belts and stock run} a registry of with. the die belt to receive sheet stock between the'two belts, a longitudinal sequence of punch members on the punch belt to coact with the die apertures ofthe die belt, and a sequence of pins .on. the punch belt to engage the perforations in the die belt to thereby drive the punch belt.

8. Apparatus for cutting blank from sheet stock, and comprising'an endles flexible die belt of sheet metal having a longitudinal sequence of equi-spaced die apertures formed therein, a drive roll and a pressroll and a tensioning roll for the die belt and all tangent to one plane to maintain a portion of the belt flat, the die belt being also formed with a sequence of drive perforations,

two belts, a longitudinal sequence of punch members on the punch belt .to'coact with the die apertures of thedie belt, a guide rolland a press roll and a second guide roll for. the punch belt arflat slab-like punch member attached to one belt,

only along a line transverse to the be1t,the other belt being formed with a die aperture to coact with the punch member, and coacting elements on the two belts to enforce registry of thepunc h member and die aperture. I 5. Apparatus for cutting blanks from sheet stock and comprising a pair of flexible belts to receive sheet stock therebetween, means to drive one of said belts, coacting means on th two belts to cause the driven belt to drive the other belt,

'a pair of pressrolls between which the belts and stock run, a flat slab-like punch member attached to one belt only along a line transverse to the belt, andthe other belt being formed with a die aperture to coact with the punch member. r

6. Apparatus ,for cutting blanks from sheet ranged to lead the punchbelt to the die belt between the two press rolls at an angle to the die belt, and a sequence of pins on the punch belt to engage the perforations in the die belt to thereby drive the punch belt.

stock and comprising a pair of flexible belts to 5 9. In an apparatu for cuttingblanks from sheet stock and having a die apertured die belt and -a punch belt to coact therewith, a punch assembly on the punch belt and comprising a punch proper, a base therefor, a registering elementon the base, means to secure the base rigidly to the punch proper and to attach both to the punch belt only along a line transverse to the punch belt, and the die belt being provided with a sec ond registering element to coactwith the first named registering element to enforce accurate registry of the punch proper with a die aperture of the die belt. I

, BERJILEDELMAN. 

